Natura - nature actualia - actual entities Mundus Plinius - physical world Astra Plinius - celestial bodies Universe (Supercluster) Virgo-Hydra-Centaurus Supercluster (Supercluster) Virgo Supercluster (Cluster) Local Group (Galaxy) Milky Way Galaxy veter. (Spiral arm) Orion Arm (Region) Local Bubble Local Interstellar Cloud (Planetary system) Solar System (Planet-satellite system) Earth System (Planet) Earth veter. "spheres" (Earth) (Sphere) Hydrosphere (Earth) - layer of water (Drainage basin) Atlantic Ocean Basin (Drainage basin) American Mediterranean Sea Basin (America) (Drainage basin) Gulf of Mexico Basin 0 (Bay) Gulf of Mexico 1 (Drainage basin) Suwannee River Basin (United States: Florida: Dixie County) 2.1.301834N0875213W (Bay) Bon Secour Bay (United States: Alabama: Baldwin County) 2.2 (Drainage basin) Mobile Bay Basin (United States) 2.3.301349N0880512W (Bay) Pelican Bay (United States: Alabama: Mobile County) 3.1.0.301601N0883100W (Bay) Mississippi Sound (United States: Mississippi: Jackson County) 3.1.1.302101N0881500W (Bay) Portersville Bay (United States: Alabama: Mobile County) 3.1.2.302306N0882050W (Bay) Grand Bay (United States: Alabama: Mobile County) 3.1.3.302042N0882546W (Bay) Point Aux Chenes Bay (United States: Mississippi: Jackson County) 3.1.4.302103N0883605W (Bay) Pascagoula Bay (United States: Mississippi: Jackson County) 3.1.5.302302N0884944W (Bay) Biloxi Bay (United States: Mississippi: Harrison County) 3.1.6.302104N0891901W (Bay) Saint Louis Bay (United States: Mississippi: Hancock County) 3.1.7.1.300232N0892554W (Bay) Blind Bay (United States: Louisiana: St. Bernard Parish) 3.1.7.2.300231N0892405W (Lake) Kennedys Lagoon (United States: Louisiana: St. Bernard Parish) 3.2.0.300141N0893703W (Bay) Lake Borgne (United States: Louisiana: St. Bernard Parish) 3.2.1.301105N0892832W (Bay) Heron Bay (United States: Mississippi: Hancock County) 3.2.2 (Drainage basin) Pearl River Basin (United States: Mississippi, Louisiana) 3.2.3.301022N0893331W (Bay) Polecat Bend (United States: Louisiana: St. Tammany Parish) 3.2.4.1.300736N0894352W (Lake) Lake Saint Catherine (United States: Louisiana: Orleans Parish) 3.2.4.2 Drainage basin Lake Pontchartrain Basin (United States: Louisiana) 3.2.5.300305N0894245W (Bay) Alligator Bend (United States: Louisiana: St. Bernard Parish) 4 (Drainage basin) Mississippi River Basin (United States, Canada) 5 (Drainage basin) Rio Grande Basin (United States, Mexico)